I have been combining conditioning and assistance for one session done normally 0-3 hours after strength training. The reason I'll do this is completely for social purposes (I'll go to the gym alone, but do the assistance work and conditioning with my wife), not because this would be any kind of "secret solution" for anything. We have used same logic what Jim uses in his article "Conditioning When Weather Suck".
Since I'm doing mainly different 3 day-a-week full-body templates its clear I must be very cautious of what I'm going to do. Upper body pulling, push ups, ab work, step ups, kb swings, running and jumping rope (or something similar in nature) are the building blocks for our sessions.
The question is: Do anybody else here (Jim or others) do this? Do you have any tips or other notes about the subject.